Submitted on: 22 August 2007.
Revised on: 13 December 2007.
Accepted on: 17 January 2008.
___________________Global Trade and Customs Journal
Submitted on: 08 December 2011.
Revised on: 31 December 2011.
Accepted on: 13 January 2012.
___________________Global Trade and Customs Journal
Submitted on: 01 July 2005.
Revised on: 11 September 2005.
Accepted on: 01 October 2005.
___________________Global Trade and Customs Journal
http://reply.papertrans.cn/2/109/10867/10867-24.png
Submitted on: 30 June 2011.
Revised on: 25 October 2011.
Accepted on: 28 November 2011.
___________________Global Trade and Customs Journal
Submitted on: 08 December 2010.
Revised on: 03 March 2011.
Accepted on: 20 April 2011.
___________________Global Trade and Customs Journal
Submitted on: 03 September 2013.
Revised on: 11 October 2013.
Accepted on: 10 November 2013.
___________________Global Trade and Customs Journal
http://reply.papertrans.cn/2/109/10867/10867-28.png
http://reply.papertrans.cn/2/109/10867/10867-29.png
Submitted on: 17 February 2017.
Revised on: 12 March 2017.
Accepted on: 22 March 2017.
___________________Global Trade and Customs Journal